From Roissy Charles de Gaulle airport Take the A1 Motorway, then take the turn-off for the A3 (signs for "Paris-Est"), exit 'Noisy-le-Sec/Bobigny'. Cross the bridge over the canal. Follow signs for 'Porte de Pantin', RN3. 500 m after the underpass, turn left into the rue de la Commune de Paris. Then turn left into Avenue Gaston Roussel and then right to enter the Biocitech Technology Park